JOYING for Audi A4 S4 RS4 2002-2008 Quad Core Android 4.4.4 kitkat Double Din Car Stereo Head Unit Touch Screen 7 Inch 1024600 Resolution GPS Navigation System Support Bluetooth/WiFi/3G/4G CPU: RK3188 1.6GHz Cortex A9 Quad Core, responsive, much faster than dual core, OS: Android 4.4.4 Kitkat, pure run most recent, stable Version If your AUDI vehicle has factory amplifier like Bose system, sorry that we have no the suitable adapter to install the unit and get the sound normally. You can find the amplifier adapter or bypass the amplifier directly, If not, we advice you don't buy this item, thanks for your understand. 7 Inch 1024*600 Resolution HD Capacitive Muti-Touch Screen. You will have a better visual experience when driving We provide 24-month warranty of free replacing with defected parts. (Not included shipping charges) Fast Ship Service: DHL/EMS (based on your shipping address)